Returns the distance between the fields f1 and f2 in f3.
Example
TABLES LFA1. DATA DIS TYPE P. DESCRIBE DISTANCE BETWEEN LFA1-LAND1
AND LFA1-NAME1
INTO DIS.
Result: DIS contains the value 14, since exactly two fields lie between LAND1 and NAME1, namely LNRZA
(10 bytes) and LOEVM (1 byte); additionally, the sub-field LAND1 is 3 bytes long. Therefore, the start of the sub-field LAND1 is exactly 14 bytes from the start of the sub-field NAME1.